IMLAC, ARDS, Datapoint), it firsts clears the screen.
Typing `^G` (`CTRL`+`G`) causes Muddle to stop whatever it is doing
-and act as if an error had occurred ([section
-1.4](#14-errors-simple-considerations-1)). `^G` is generally most
-useful for temporary interruptions to check the progress of a
+and act as if an error had occurred (section 1.4). `^G` is generally
+most useful for temporary interruptions to check the progress of a
computation. `^G` is "reversible" -- that is, it does not destroy any
of the "state" of the computation it interrupts. To "undo" a `^G`,
type the characters
(This is discussed more fully far below, in section 16.4.)
Typing `^S` (`CTRL`+`S`) causes Muddle to **throw away** what it is
-currently doing and return a normal "listening" state. (In the Tenex
-and Tops-20 versions, `^O` also should have the same effect.) `^S` is
-generally most useful for aborting infinite loops and similar terrible
-things. `^S` **destroys** whatever is going on, and so it is **not**
-reversible.
+currently doing and return to a normal "listening" state. (In the
+Tenex and Tops-20 versions, `^O` also should have the same effect.)
+`^S` is generally most useful for aborting infinite loops and similar
+terrible things. `^S` **destroys** whatever is going on, and so it is
+**not** reversible.
Most expressions in Muddle include "brackets" (generically meant) that
must be correctly paired and nested. If you end your typing with the